CN105068125A - Millimeter-wave imaging system based on adjustable intermediate frequency attenuator - Google Patents
Millimeter-wave imaging system based on adjustable intermediate frequency attenuator Download PDFInfo
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- CN105068125A CN105068125A CN201510381727.3A CN201510381727A CN105068125A CN 105068125 A CN105068125 A CN 105068125A CN 201510381727 A CN201510381727 A CN 201510381727A CN 105068125 A CN105068125 A CN 105068125A
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Abstract
The invention relates to a millimeter-wave imaging system based on an adjustable intermediate frequency attenuator, and the system comprises a control and processing unit, a frequency source, a transmitting unit, and a receiving unit, wherein the frequency source supplies working frequency to the transmitting unit and the receiving unit. The transmitting unit is connected with a transmitting antenna array, and the receiving unit is connected with a receiving antenna array. The control and processing unit is used for controlling the on/off of the transmitting antenna array and the receiving antenna array. The system also comprises the adjustable intermediate frequency attenuator which is connected with the receiving unit. The control and processing unit controls the attenuation values of different channels through the adjustable intermediate frequency attenuator, thereby enabling the amplitudes of analog signals obtained by the control and processing unit. Moreover, the attenuation values of all channels are stored. The system can enable he difference among signal intensities to be small after frequency mixing of received signals from different channels.
Description
Technical field
The present invention relates to mm-wave imaging technical field, particularly relate to a kind of millimeter wave imaging system based on adjustable mean frequency attenuator.
Background technology
In the face of the increasingly serious threat of terrorism, the individual safety check of public arena becomes more and more important.Mm-wave imaging is widely studied due to advantages such as it are harmless, recognizable object is wide.Mm-wave imaging detection instrument is based on millimeter wave principle of reflection, reflect millimeter is utilized to carry out Scanning Detction to human body, the contraband goods and dangerous material of concealing under human body clothing can be effectively detected when directly not contacting human body, as gun, cutter, explosive, drugs etc., and show testing result in the mode of image, the human body safety check demand in the places such as airport, station, critical point, land route, important rally activity can be met.
Millimeter wave imaging system generally adopts multichannel array to scan the working method of target, but due to the components and parts of different passage and the difference of link, need the difference of our each passage of calibration in advance imaging system, comprise the calibration in the face of infinite metal plate and the absorbing material in the face of hypersorption.And under the condition be namely totally reflected in the face of infinite metal plate, intermediate-freuqncy signal power may be widely different after the Received signal strength mixing of different passage, be greater than the peak-to-peak value of digital-to-analog conversion sampling A/D chip, thus the digital-to-analog conversion work after causing is difficult to carry out.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of millimeter wave imaging system based on adjustable mean frequency attenuator, realizes at the Received signal strength mixed signal strength difference of different passage little.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of millimeter wave imaging system based on adjustable mean frequency attenuator, comprise and controlling and processing unit, frequency source, transmitter unit and receiving element, described frequency source provides frequency of operation to described transmitter unit and receiving element; Described transmitter unit is connected with transmitting antenna array, and described receiving element is connected with receiving antenna array, and described control and processing unit, for controlling the switch of transmitting antenna array and receiving antenna array, also comprise the adjustable mean frequency attenuator be connected with receiving element; Described control and processing unit control the pad value of corresponding different passage by adjustable mean frequency attenuator, the analogue signal amplitude that control and processing unit are obtained is identical, and stores the pad value for each passage.
Described frequency source is controlled by described control and processing unit.
Beneficial effect
Owing to have employed above-mentioned technical scheme, the present invention compared with prior art, there is following advantage and good effect: the present invention adds adjustable mean frequency attenuator at middle frequency link, the pad value of corresponding different passage is controlled by control module, the analogue signal amplitude that digital signal processing unit is obtained is substantially identical, and stores the pad value for each passage.The pad value that ensuing hypersorption scanning corresponds to different passage with guarantee during realistic objective is identical with the pad value mixed up before, ensures that attenuator does not introduce opposing channel difference, realize target imaging.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.Should be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiments of the present invention relate to a kind of millimeter wave imaging system based on adjustable mean frequency attenuator, as shown in Figure 1, comprise and controlling and processing unit 1, frequency source 2, transmitter unit 3 and receiving element 4, described frequency source 2 provides frequency of operation to described transmitter unit 3 and receiving element 4, wherein, described frequency source 2 is controlled by described control and processing unit 1; Described transmitter unit 3 is connected with transmitting antenna array 6, described receiving element 4 is connected with receiving antenna array 7, described control and processing unit 1, for controlling the switch of transmitting antenna array 6 and receiving antenna array 7, also comprise the adjustable mean frequency attenuator 5 be connected with receiving element 4; Described control and processing unit 1 control the pad value of corresponding different passage by adjustable mean frequency attenuator 5, make control identical from the analogue signal amplitude that processing unit 1 obtains (namely realizing in the little object of the Received signal strength mixed signal strength difference of different passage), and store the pad value for each passage.
When the present invention uses, first need, by this this millimeter wave imaging system in the face of infinite metal plate, to implement calibration.In the process of array scanning, control and processing unit 1 is constantly allowed to adjust the damping capacity size of adjustable mean frequency attenuator 5, the effect finally reached is that the intermediate-freuqncy signal amplitude obtained for different passage is roughly the same, and stores the pad value size of the adjustable mean frequency attenuator 5 corresponding to different passage.Then by this millimeter wave imaging system in the face of absorbing material and realistic objective scan respectively, under these two kinds of scanning modes, need to allow control and processing unit 1 control adjustable mean frequency attenuator 5 and show as when different passage the pad value stored, only in this way, people adds adjustable mean frequency attenuator 5 just can not cause relative channel difference, thus realize target imaging.
Claims (2)
1. the millimeter wave imaging system based on adjustable mean frequency attenuator, comprise and controlling and processing unit (1), frequency source (2), transmitter unit (3) and receiving element (4), described frequency source (2) provides frequency of operation to described transmitter unit (3) and receiving element (4); Described transmitter unit (3) is connected with transmitting antenna array (6), described receiving element (4) is connected with receiving antenna array (7), described control and processing unit (1) are for controlling the switch of transmitting antenna array (6) and receiving antenna array (7), it is characterized in that, also comprise the adjustable mean frequency attenuator (5) be connected with receiving element (4); Described control and processing unit (1) control the pad value of corresponding different passage by adjustable mean frequency attenuator (5), make control identical with the analogue signal amplitude that processing unit (1) obtains, and store the pad value for each passage.
2. the millimeter wave imaging system based on adjustable mean frequency attenuator according to claim 1, is characterized in that, described frequency source (2) is controlled by described control and processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510381727.3A CN105068125A (en) | 2015-07-02 | 2015-07-02 | Millimeter-wave imaging system based on adjustable intermediate frequency attenuator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510381727.3A CN105068125A (en) | 2015-07-02 | 2015-07-02 | Millimeter-wave imaging system based on adjustable intermediate frequency attenuator |
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| CN105068125A true CN105068125A (en) | 2015-11-18 |
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| CN201510381727.3A Pending CN105068125A (en) | 2015-07-02 | 2015-07-02 | Millimeter-wave imaging system based on adjustable intermediate frequency attenuator |
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Cited By (1)
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| WO2019024170A1 (en) * | 2017-07-31 | 2019-02-07 | 深圳市无牙太赫兹科技有限公司 | Safety inspection system and method based on millimeter-wave real-time imaging |
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Application publication date: 20151118 |
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